<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        function Star(uname, age) {
            this.uname = uname;
            this.age = age;
        }

        Star.prototype.sing = function sing() {
            console.log('我会唱歌');
        }
        
        // Star.prototype.sex = '男'
        Object.prototype.sex = ['男', '女']

        const ldh = new Star('刘德华', 18)

        console.dir(ldh.toString, 'to');


        function People() {
        }

        const xiaoMing = new People();
        console.log(xiaoMing.sex); 
    </script>
</body>

</html>